1,720,959 research outputs found
Perancangan Alat Pembuangan Abu Pada Gasifier Sistem Kontinu Berbahan Bakar Tongkol Jagung
Full text linkAbstrak  Indonesia membutuhkan energi alternatif yang berpeluang besar untuk dikembangkan pemanfaatannya, salah satunya adalah energi biomassa yang berasal dari jagung. Pada penelitian sebelumnya sudah dirancang dan dibuat sistem gasifikasi kontinu, tetapi masih terdapat kekurangan pada pemisahan abu setelah pembakaran. Tujuan dari penelitian ini adalah untuk merancang sistem pemisah abu pada sistem gasifikasi kontinu sehingga didapatkan spesifikasi dari sistem pemisah abu tersebut. Sistem pemisah abu yang dirancang adalah screw conveyor untuk memisahkan bottom ash dan siklon untuk memisahkan fly ash. Hasil perancangan diperoleh spesifikasi yang dibutuhkan yaitu diameter screw sebesar 6 inci, motor listrik yang digunakan memiliki daya 1 HP, putaran screw sebesar 0,31 rpm dan poros screw conveyor sebesar 2 inci. Dengan standar yang sudah diberikan, dengan mengasumsikan diameter body siklon sebesar 0,1 m maka diperoleh seluruh dimensi siklon. Dengan diameter sebesar 0,1 m secara perhitungan didapat efisiensi siklon sebesar 78% dan secara simulasi menggunakan software ANSYS didapat efisiensi sebesar 80%. Kata kunci: tongkol jagung, gasifikasi, screw conveyor, siklon, ANSYS Abstract  Indonesia needs alternative energy that has a great opportunity to be developed its utilization, one of which is biomass energy derived from corn. In previous studies, a continuous gasification system has been designed and built, but there are still deficiencies in the separation of ash after combustion. The purpose of this research is to design an ash separator system in a continuous gasification system so that the specifications of the ash separator system can be obtained. The ash separator system designed is a screw conveyor for separating bottom ash and cyclones for separating fly ash. The design results obtained the required specifications, the screw diameter is 6 inches, the electric motor used has a power of 1 HP, the screw rotation is 0.31 rpm and the screw conveyor shaft is 2 inches. With the standards that have been given, assuming the diameter of the cyclone body is 0.1 m, all the dimensions of the cyclone are obtained. With a diameter of 0.1 m, the calculation is that the cyclone efficiency is 78% and by simulation using the ANSYS software, the efficiency is 80%. Key words: corn cobs, gasification, screw conveyor, cyclone, ANSY
Rancang Bangun Rangka Kendaraan Penyemprot Hama Otomatis
Full text linkAbstrak Dari berbagai cara pengaplikasian pestisida, penyemprotan merupakan aplikasi pestisida yang paling umum. Di Indonesia sendiri penyemprotan dilakukan secara manual. Penyemprotan manual memiliki kendala yaitu membutuhkan tenaga manusia. Penyemprotan secara manual mengakibatkan petani akan mudah terpapar oleh pestisida sehingga diperlukan adanya penyemprot hama otomatis. Tujuan penelitian ini adalah merancang bangun rangka kendaraan penyemprot hama otomatis untuk tanaman hortikultura. Rangka didesain menggunakan software Solidworks 2016 untuk mensimulasikan kekuatan rangka. Dari simulasi rangka dengan bahan yang digunakan baja ASTM A36 diketahui nilai yield strength bahan ASTM A36 2,5 X 108 N/m2 didapat nilai tegangan tertinggi 3,461 x 107 N/m2. Rangka ini menggunakan baja siku berukuran 50 mm x 50 mm x 5 mm. Jenis rangka yang jadi acuan yaitu jenis rangka ladder frame, yaitu jenis rangka menyerupai tangga, dengan jenis rangka ini memiliki kelebihan kekuatan yang tinggi. Roda yang digunakan adalah roda sepeda dengan diameter 19 cm dan tebal 4 cm. Motor penggerak yang digunakan yaitu tipe gearbox. Dimensi kendaraan, panjang = 320 cm, lebar = 80 mm, dan tinggi 150 mm. jenis transmisi yang digunakan yaitu transmisi roda gigi lurus dengan perbandingan gigi 16 : 32. Hasil pengujian pembebanan pada kondisi kendaraan diam dan bergerak, bahwa rangka mampu menahan semua beban komponen – komponen yang ada seperti box elektrikal, tangki pestisida, dan pompa.  Kata kunci: pestisida, ASTM A36, Kendaraan Penyemprot Hama, Ladder Frame. Abstract Of the various ways of application of pesticides, spraying is the most common application of pesticides. In Indonesia, the spraying is done manually. Manual spraying has a problem. Namely, it requires human labour. Spraying manually causes farmers to be easily exposed to pesticides, so an automatic pest sprayer is needed. The purpose of this study was to design an automatic pest spraying vehicle frame for horticultural crops. The frame is designed using Solidworks 2016 software to simulate the strength of the frame. From the simulation of the frame with the material used by ASTM A36 steel, it is known that the yield strength value of ASTM A36 material is 2.5 X 108 N / m2, the highest stress value is 3.461 x 107 N / m2. This frame uses steel angles measuring 50 mm x 50 mm x 5 mm. The type of frame that is the reference is the type of ladder frame, a type of frame that resembles a ladder, with this type of frame having a high strength advantage. The wheels used are bicycle wheels with a diameter of 19 cm and a thickness of 4 cm. The driving motor used is the gearbox type. Vehicle dimensions, length = 320 cm, width = 80 mm, and height 150 mm. The type of transmission used is a straight gear transmission with a gear ratio of 16: 32. The results of loading tests on stationary and moving vehicle conditions show that the frame can withstand all the load of existing components such as electrical boxes, pesticide tanks, and pumps. Keyword : pesticide, ASTM A36, Pest Spraying Vehicles, Ladder Fram
Modification of Drivetrain and Control System Plastic Mulch Hole Puncher Vehicle
Full text linkA mechanical mulching becoming popular due to the shortage of labor [1]. Plastic Mulch Hole Puncher Vehicle have been developed from research about Design of a Remote Control System as a Semi-Automatic Plastic Mulch Hole Puncher [2] and Automatic Pest Spraying Vehicle Frame Design [3]. The drivetrain that has been developed uses 4 wheels so it can slip if it encounters muddy terrain. In this research, we modified the drivetrain like a tank so that the vehicle can move in all situations. In previous research, the control system used was Fly Sky Remote Control and Arduino MEGA to control the Plastic Mulch Hole Puncher. In this research, we modified the remote and controller using a pair of microcontroller and radio frequency modules. For the drivetrain, the method used in this research is a modification using a pair of chains with metal plates welded to each outer link and 4 sprocket for the left and right sides. The chains and sprockets used are for motorbikes, and the metal plates using ST37 with dimensions 60 x 15 x 3 mm. For the control system, the method used in this research is to combine data reception from the transmitter and actuator movement with Arduino UNO and nRF24L01 module. In vehicle, 11 Digital Pins of Arduino UNO connected to: nRF24L01 via adapter module, 2 BTS 7960 motor driver that connect to power windows motor for automotive use, and 2 relay module to drive 2 pneumatic DCV (Direct Control Valve) that connected with Mulch Hole Puncher. In transmitter, 7 Digital Pins of Arduino UNO connected to: nRF24L01 via adapter module and 2 push button for activated pneumatic DCV /Mulch Hole Puncher, meanwhile 2 Analog Pins connected to joystick for control vehicle movement (froward/backward, turn left/right). The results of this research, the vehicle can be driven using a new drivetrain and controlled by Arduino UNO and nRF24L01 using radio frequency.Keywords: tank drivetrain, open-source microcontroller, radio frequenc
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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